from _decimal import Decimal
from django_redis import get_redis_connection
from rest_framework.generics import CreateAPIView
from rest_framework.permissions import IsAuthenticated
from rest_framework.views import APIView
from goods.models import SKU
from rest_framework.response import Response
from orders.serialziers import OrderSettlementSerializer, SaveOrderSerializer


class OrderSettlementView(APIView):
    """订单结算"""

    permission_classes = [IsAuthenticated]

    def get(self, request):
        """获取"""

        user = request.user

        # 从购物车中获取用户勾选要结算的商品信息
        redis_conn = get_redis_connection("cart")
        redis_cart = redis_conn.hgetall("cart_%s" % user.id)
        cart_selected = redis_conn.smembers("cart_selected_%s" % user.id)

        cart = {}
        for sku_id in cart_selected:
            cart[int(sku_id)] = int(redis_cart[sku_id])

        # 查询商品信息
        skus = SKU.objects.filter(id__in=cart.keys())
        for sku in skus:
            sku.count = cart[sku.id]

        # 运费
        freight = Decimal("10.00")

        serializer = OrderSettlementSerializer({"freight": freight, "skus": skus})
        return Response(serializer.data)


class SaveOrderView(CreateAPIView):
    """保存订单"""

    permission_classes = [IsAuthenticated]
    serializer_class = SaveOrderSerializer
